Wosnitza, J , Hagel, J , Meeson, P J , Bintley, D , Schlueter, J A , Mohtasham, J , Winter, R W and Gard, G L (2003) Enhanced magnetic quantum oscillations in the mixed state of a two-dimensional organic superconductor. Physical Review B, 67 (6).
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We report on de Haas-van Alphen (dHvA) oscillations observed in the mixed state of the organic superconductor beta"-(BEDT-TTF)(2)SF5CH2CF2SO3 (BEDT-TTF stands for bisethylenedithio-tetrathiafulvalene) utilizing the field-modulation technique and torque magnetometry. At low temperatures (30 mK), the dHvA signal persists down to 1.4 T well below the upper critical field B(c2)approximate to3.6 T. Contrary to most theoretical predictions and previous experimental findings, no additional damping of the dHvA-oscillation amplitude, but a reduced damping of the dHvA signal is found. This highly unusual effect might indicate a reduced quasiparticle scattering rate or an additional oscillatory contribution in the superconducting state.
This is a Submitted version This version's date is: 1/2/2003 This item is not peer reviewed
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